Before Enabling Hidden Menus (Dialer) you will need a “File Manager/Explorer” that has Root Access, if you do not currently have one, follow my instructions below and I will provide you with one free of charge.

Root File Manager/Explorer
This app is called File Manager (Explorer) by Rhythm Software, click >>[HERE]<< to download once completed click open. Go into the “Settings”> go into the Set Home Directory and change the current path from: /storage/emulated/0 to / and hit the OK and it should display “/” in the Settings menu. Scroll down to Root Settings> Root Explorer and check the 1st box, Mount System Folders will become an option check this option as well, there should be 2 boxes checked total under Root Settings (Advanced Users). Congratulations, you have a FREE Root File Manager/Explorer.

It is also Recommended that you Backup your "EFS" Partition before making a changes....

Access Hidden Menu1) To access the Hidden Menu you must open up the Root File Manager/Explorer (or similar Application) to “/” go into “efs”> “carrier”> “HiddenMenu” press down to Open> then select Text with Text Editor> ***IMPORTANT*** USE CAPITALS *** change the >OFF< to >ON<
2) Save the Changes
3) Exit, Exit, Exit, Exit, & Battey Pull/Reboot.

All codes in post #2 should work with most Note2 devices. But if not then do the above^^^^^^^^^^^^ steps!!!!

WARNING THESE COMMANDS MAY ALTER THE SETTINGS OF YOUR DEVICE, CAN MAKE YOUR DEVICE FUNCTION IMPROPERLY DO NOT MAKE CHANGES TO SETTINGS IF YOU ARE UNSURE WHAT THE OUTCOME WILL BE. RESPONSIBILITY FOR ACTIONS ATTEMPTED ARE AT YOUR OWN RISK, NOT THE OP’S, AND CERTAINLY NOT THE RESPONSIBILITIES OF XDADEVELOPERS.COM (YOU HAVE BEEN WARNED)

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